<template>
  <div id="app">
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item><a href="/">数据统计</a></el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 商品视图区域 -->
      <!-- 2.为echarts视图准备的DOM区域 -->
      <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
  </div>
</template>
<script>
import echarts from 'echarts'
import _ from 'lodash'

export default {
  data() {
    return {
      options: {
        title: {
          text: '用户来源'
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'cross',
            label: {
              backgroundColor: '#E9EEF3'
            }
          }
        },
        grid: {
          left: '3%',
          right: '4%',
          bottom: '3%',
          containLabel: true
        },
        xAxis: [
          {
            boundaryGap: false
          }
        ],
        yAxis: [
          {
            type: 'value'
          }
        ]
      }
    }
  },
  //等html页面挂载之后（页面渲染完毕）执行的钩子函数
  async mounted() {
    //基于准备好的dom，初始化echarts实例
    const myChart = echarts.init(document.getElementById('main'))
    //获取数据库的视图数据
    const { data: res } = await this.$http.get('reports/type/1')
    if (res.meta.status !== 200) {
      return this.$message.error('获取时间统计的折线图失败')
    }
    console.log(res.data)
    // 将数据深拷贝一份与return中的数据合并,用到深拷贝merge方法
    const result = _.merge(res.data, this.options)
    myChart.setOption(result)
  }
}
</script>
<style lang="less" scoped></style>
